The devices consist of hBN encapsulated twisted bilayer graphene (tBLG) on a \(Si/SiO_2\)  substrate. The typical length and width of the devices are \(\sim 6\mu m\)  and \(\sim 2\mu m\) , respectively. The usual `tear and stack' technique [1]}, [2]} is used to fabricate the device and is described in detail in the supplementary information (SI-1). For the resistance measurement, we employ the low-frequency (\(\sim 13 Hz\) ) lock-in technique (SI-3). For the thermopower measurement, an isolated gold line, as shown in Fig.1a, is placed parallel to one side of the tBLG at a separation of \(\sim 3\mu m\) . Passing a current (\(I_{\omega }\) ) through the heater creates a temperature gradient across the length of the tBLG as depicted by the color gradient (red to blue) in Fig. 1a. As a result, the contact near to the heater will be hotter (\(T_h\) ) compared to the far contact (\(T_c\) ). The temperature of the far contact (\(T_c\) ) is maintained at the bath temperature of the cryo-free dilution fridge by directly anchoring it to the cold finger attached to the mixing chamber plate , which we call a cold ground (c.g). To measure \(\Delta T\) , we have utilized Johnson noise thermometry. As shown in Fig. 1a, the thermometry circuit consists of a LC resonant (\(f_r\sim 720kHz\) ) tank circuit, followed by a cryogenic amplifier (ca). The relay sitting at the mixing chamber plate (Fig. 1a) is used to switch between the thermoelectric voltage and temperature measurement.
